test: Add testcase setup object for test_cmux

Also remove a scheduler_init() from a test and MOCK the appropriate function
so the test can pass.

This is done in order to minimize initialization functions in the unit test
and try to only go through the testcase setup object.

Signed-off-by: David Goulet <dgoulet@torproject.org>

src/test/test_circuitmux.c

@@ -17,6 +17,16 @@
 
 #include <math.h>
 
+/**
+ * MOCKED functions.
+ */
+static void
+scheduler_release_channel_mock(channel_t *chan)
+{
+  (void) chan;
+  return;
+}
+
 /* XXXX duplicated function from test_circuitlist.c */
 static channel_t *
 new_fake_channel(void)
@@ -44,7 +54,7 @@ test_cmux_destroy_cell_queue(void *arg)
   packed_cell_t *pc = NULL;
   destroy_cell_t *dc = NULL;
 
-  scheduler_init();
+  MOCK(scheduler_release_channel, scheduler_release_channel_mock);
 
   (void) arg;
 
@@ -82,6 +92,8 @@ test_cmux_destroy_cell_queue(void *arg)
   channel_free(ch);
   packed_cell_free(pc);
   tor_free(dc);
+
+  UNMOCK(scheduler_release_channel);
 }
 
 static void
@@ -125,9 +137,40 @@ test_cmux_compute_ticks(void *arg)
   ;
 }
 
+static void *
+cmux_setup_test(const struct testcase_t *tc)
+{
+  static int whatever;
+
+  (void) tc;
+
+  cell_ewma_initialize_ticks();
+  return &whatever;
+}
+
+static int
+cmux_cleanup_test(const struct testcase_t *tc, void *ptr)
+{
+  (void) tc;
+  (void) ptr;
+
+  circuitmux_ewma_free_all();
+
+  return 1;
+}
+
+static struct testcase_setup_t cmux_test_setup = {
+  .setup_fn = cmux_setup_test,
+  .cleanup_fn = cmux_cleanup_test,
+};
+
+#define TEST_CMUX(name) \
+  { #name, test_cmux_##name, TT_FORK, &cmux_test_setup, NULL }
+
 struct testcase_t circuitmux_tests[] = {
-  { "destroy_cell_queue", test_cmux_destroy_cell_queue, TT_FORK, NULL, NULL },
-  { "compute_ticks", test_cmux_compute_ticks, TT_FORK, NULL, NULL },
+  TEST_CMUX(compute_ticks),
+  TEST_CMUX(destroy_cell_queue),
+
   END_OF_TESTCASES
 };